低渗透油藏渗透率及启动压力梯度应力敏感性分析
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李玉丹(1992—),女,河北邢台人,在读博士研究生,从事油气田开发工程方面的研究。联系电话:13261968538,E-mail:1533141753@qq.com。

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国家自然科学基金项目“裂缝性油气藏流固耦合渗流基础研究”(50004002)。


Stress sensitivity analysis of permeability and threshold pressure gradient in low-permeability reservoir
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    摘要:

    为了研究低渗透油藏在开发过程中伴随的储层物性及流体渗流参数变化规律,基于岩心堆积模型分形理论及材料力学原理,结合低渗透油藏非线性渗流特征,建立低渗透储层渗透率及启动压力梯度应力敏感理论计算模型,定量分析岩石力学参数对储层应力敏感性的影响,并通过理论模型计算结果与实验数据对比分析,验证应力敏感模型的有效性。研究结果表明:随着有效应力增加,渗透率呈下降趋势,而启动压力梯度呈上升趋势,且在有效应力作用下的正则化渗透率与启动压力梯度满足较好的乘幂关系;渗透率及启动压力梯度应力敏感性与岩石力学性质密切相关,岩石杨氏模量越大,渗透率及启动压力梯度应力敏感程度越弱,同一弹性模量的岩石泊松比越小,渗透率及启动压力梯度应力敏感程度越强;该模型可准确预测渗透率及启动压力梯度的应力敏感性,从而为低渗透油藏渗流规律研究及产能方案制定提供理论支撑。

    Abstract:

    In order to study the variation of the rock physical property parameter and fluid flow parameter during the development of low-permeability reservoir,a new stress sensitivity predictive model for permeability and threshold pressure gradient in the low-permeability reservoir has been derived theoretically combined with the non-linear seepage feature based on the fractal theory of core accumulation model and mechanics of materials. The variation of permeability and threshold pressure gradient versus the effective stress with different mechanical parameters was quantitatively analyzed. Validity of the stress sensitivity model was verified through comparison between theoretical model result and those of available experimental data. The research results show that:the permeability decreases and the threshold pressure gradient increases as the effective stress increases,and the normalized permeability and threshold pressure gradient has a better power function relationship under the effective stress. Stress sensitivity of permeability and threshold pressure gradient is closely relative to the mechanical parameters of rock,higher Young’s modulus presents a relative weaker stress sensitivity of permeability and threshold pressure gradient,and lower Poisson’s ratio exhibits a more stress sensitive threshold pressure gradient and permeability under the same Young’s modulus. The model could accurately predict the stress sensitivity of permeability and threshold pressure gradient,thereby offer a theoretical base and guide for flow rule research and design for production performance in the low-permeability reservoir.

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李玉丹,董平川,张荷,雷刚,曹耐,吴子森.低渗透油藏渗透率及启动压力梯度应力敏感性分析[J].油气地质与采收率,2016,23(6):57~63

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  • 在线发布日期: 2016-10-20